The technology of LED light source is becoming more and more mature, and the luminous lumen per watt is growing rapidly, which makes it reduce the price every year. Taking the 1W LED light source as an example, the price in the spring of 2008 is one-third of the price in the spring of 2006, and will fall to a quarter in 2006 in the spring of 2009. The massive market of LED green lamps and the continuous growth and demand for several years will be the super tsunami in the IC industry after the VCD, DVD, mobile phones and MP3s!
The high performance, long life and environmentally friendly performance of LED lamps are widely recognized.
LED high energy saving: DC drive, ultra-low power consumption (single tube 0.03 watts - 1 watt) electro-optical power conversion is close to 100%, the same lighting effect is more than 80% energy saving than traditional light source. Led long life: led light source is called longevity lamp. Solid cold light source, epoxy resin package, there is no loose part in the lamp body, there are no shortcomings such as filament light-emitting, heat deposition, fast light decay and so on.
LED life: The service life can reach 50,000 to 100,000 hours, which is more than 10 times longer than the traditional light source.
LED environmental protection: led is a green light source, and environmental protection benefits are better. There is no ultraviolet and infrared rays in the spectrum, low heat and no stroboscopic, no radiation, and waste can be recycled, no pollution, no mercury, cold light source, safe touch, is a typical green lighting source.
LED light source working characteristics The VF voltage of the LED light source for illumination is very low, generally VF=2.75-3.8V, IF is 15-1400mA; therefore, the output voltage of the LED driver IC is VFXN or VFX1, and the IF constant current is 15-1400mA. LED light source used in LED lamps has two types of low power (IF=15-20mA) and high power (IF) (200mA)). Low-power LEDs are mostly used for LED fluorescent lamps , decorative lamps and grille lamps; high-power LEDs are used for Home lighting, spotlights, underwater lights, wall washers, street lights, tunnel lights, car work lights, etc. The power LED light source is a low-voltage, high-current driving device. The intensity of the light is determined by the current flowing through the LED. If the current is too strong, the LED will be attenuated. If the current is too weak, the LED will be affected. Therefore, the LED is driven. Constant current power supply is required to ensure the safety of high-power LEDs and achieve the desired luminous intensity. In the field of LED lighting, to reflect the characteristics of energy saving and long life, it is very important to choose a good LED driver IC. Without the matching of good driver IC, the advantages of LED lighting cannot be reflected. Therefore, the LED lighting design needs attention to the technical details of the LED luminaire requirements for low-voltage driver chips:
1. The nominal input voltage range of the driver chip should meet DC8-40V to cover the application surface. The withstand voltage should be greater than 45V. The output voltage of the simple bridge rectifier will fluctuate with the grid voltage when AC12V or 24V input. Especially when the voltage is too high, the output DC voltage will be too high. If the driver IC cannot adapt to the wide voltage range, it will be broken down when the grid voltage rises, and the LED light source will be burnt.
2. The nominal output current requirement of the driver chip is greater than 1.2-1.5A. As the LED light source for illumination, the nominal working current of the 1W power LED light source is 350mA, and the nominal working current of the 3W power LED light source is 700mA. Larger ones require more current, so the driver ICs used in LED lighting must have sufficient current output. The design of the product must be such that the driver IC operates at 70-90% of the best working area of ​​the full negative output. Driver ICs that use full negative output currents have poor heat dissipation in the narrow space of the luminaire, which is prone to fatigue and early failure.
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